绿色电子墨水显示材料的制备和性能

Preparation and performance of green encapsulated electrophoretic ink

采用硬脂胺改性的方法改善酞菁绿G颗粒与四氯乙烯液体的亲和性,获得了分散性能良好的悬浮液,有效地抑制了包囊过程中颗粒向水相中的转移.以此悬浮液为囊芯(多相),以脲甲醛树脂为壁材,用原位聚合方法制备了绿色电子墨水微胶囊.根据颜料颗粒的表观密度,控制囊芯中固体颗粒的体积分数.研究发现,油溶性乳化剂对多相囊芯的稳定和乳化有促进作用,且对壁材的沉积没有副作用;在微囊化过程中,预聚体首先发生缩聚生成树脂微粒,然后进一步在囊芯周围沉积形成微胶囊;经硬脂胺改性的酞菁绿G颗粒在电场下有一定的不可逆响应行为.

Pigment phthalocynine green G modified with octadcylamine was suspended in tetra-chloroethylene using span 80 as emulsifier, and this suspending fluid has showed superior dispersibility and stability. Urea-formaldehyde microcapsules containing the suspending fluid as the core material were prepared by in situ polymerization. The solid content in the core materials was controlled through the apparent density of the particles. Oil-soluble emulsifier can provide good stability and emulsion to the internal phase, and no side effect to the resin's deposition on the capsule surface. During the micro-encapsulated process, the prepolymer condensed to form UF particles in the aqueous solution, then the particles aggregated and deposited at the surface of internal phase. After investigated in an electric field, it was found that pigment phthalocynine green G modified with octadcylamine moved in the capsule, but they were irreversible.